\\[-1.8ex] Soil Heterogeneity & $-$0.154$^{***}$ & $-$0.002 & $-$0.003 & $-$0.004 & $-$0.008 & $-$0.010 & $-$0.012 \\ 
  & (0.026) & (0.010) & (0.010) & (0.010) & (0.010) & (0.010) & (0.010) \\ 
\\[-1.8ex] 
Observations & 393,016 & 393,016 & 393,016 & 393,016 & 393,016 & 392,967 & 392,967 \\ 
R$^{2}$ & 0.001 & 0.327 & 0.327 & 0.327 & 0.327 & 0.327 & 0.333 \\ 
